Photo places not syncing to iPhone 4S

I'm having an issue where my geotagged photo locations aren't being synced to my iPhone anymore. In iPhoto, when I click Places, I can see lots of pins on the map showing all of the locations I have taken photos. But, when I sync my photos to my iPhone, the Places are no longer syncing. When I touch the Places tab in the iPhone Photos app, I only see locations for the most recent photos that are in my camera roll and no pins for any of the photos in my photo library.